Snaking almost 1,800 miles from its source in Germany’s Black Forest to the Black Sea in Romania, the Danube is best explored slowly.

Whether biking to castles or kayaking through gorges, a trip centred on this river is the epitome of European romance.

Dividing the city's Buda and Pest sides is the impressive Danube River. Flowing roughly 1,770 miles from west Germany through Austria, Slovakia, Croatia, Serbia, Bulgaria, Romania, Moldova and ...